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07-05-2004, 10:15 PM | #1 | |
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Olds vs Pontiac same,but different
I'm having a problem with my '90 Silhoutte.
The odometer& trip O.D. don't work. The speedometer is off my about 20 mph. I don't see a speedometer cable. Are they electric? Any other info?
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Bryan '86 Nissan 720 "Time to smack that ass!" "Think long think wrong!" |
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07-06-2004, 12:03 PM | #2 | |
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Re: Olds vs Pontiac same,but different
Indeed this is electric. A small "magneto" on the transaxle generates pulses at the rate of 4000 per mile. These pulses , through the ECM, drive a step motor that increases mileage readings and the rate of the pulses generate a square wave whose average voltage is proportional to speed.
THe "book" says (in '90, this is a 3.1 eh?): - check for open contact at vehicle speed sensor (top of Transaxle) - defective sensor buffer or defective contact at buffer (behind instrument panel compartment, above convenience center(heater/AC) - defective speed sensor (less probable) A CODE 24 should come with the kind of problem you have. |
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07-06-2004, 06:05 PM | #3 | |
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Thanks LMP! I'll check it out.
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07-15-2004, 11:25 AM | #4 | |
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So it would seem that the problem I had with my guages
was with the guages themselves.I ended up buying 2 more sets from junkyard and still had to use part of the orginal set to get the guages useful & still lost the rpm guage. Seems each individual piece such as speedometer and rpm guage uses a tiny motor to operate.Similiar probs appeared on the other guage clusters as well. What a pain in the ASS!!
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07-16-2004, 07:58 AM | #5 | |
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Well indeed GM also said that in last resort, the instrument panel module itself might be the culprit. For several gauges to be in trouble together all at a sudden, there must be a common problem. In similar installations, there use to be a specific power supply - generally delivering 5 volts - for the operation of the instrument panel, but I see no reference to that in the GM book: such a power supply - it can be a simple voltage limiter - is necessary to keep instruments calibrated as the battery and system voltage varies . May be it is an integral part of the I/P module but then, the other ones you have tried should have solved the problem - unless you are very unlucky. I'm puzzled.
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07-16-2004, 08:43 AM | #6 | |
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What source are you reading from?
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07-23-2004, 11:34 AM | #7 | |
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Re: Olds vs Pontiac same,but different
1993 Pontiac Transport Service Manual , the very one they use at GM service centers. (bought from GM just as I bought the car).
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